That last question was a real toughie.
Source: tatoeba (13598011)
Ranked by relevance and common usage.
Keep "toughie" when the sentence already sounds natural, when a synonym would add unintended emphasis, or when readers need the most familiar wording. A synonym should clarify or sharpen the message, not simply make the sentence look more varied.
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Choose a synonym only if it keeps the core idea of "toughie" intact in the sentence you are editing.
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Review note: Synonym lists are ranked with lexical data and reviewed for practical writing value. Use the comparison notes, sentence evidence, and source labels together; a high-ranking synonym can still be wrong when the audience, register, or grammar changes.
After choosing a replacement for "toughie", read the sentence once for meaning and once for rhythm. The best synonym should feel natural in the full sentence, not only accurate in a word list.
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9 total sentences available.
That last question was a real toughie.
Source: tatoeba (13598011)
His question is a toughie. I might have to do some more research.
Source: wiktionary
Sansevieria and aspidistra are two old houseplant toughies that make good indoor choices.
Source: wiktionary
With typical courage she had taken hold of her life and changed it for the better. She always was a brave little toughie, and now her courage had paid off.
Source: wiktionary
Showing 4 of 9 available sentences.
Closest matches include stumper, challenge, conundrum, difficult person, formidable opponent.
Compare the replacement against real sentence context. This entry includes sample sentences so you can check tone, grammar, and meaning before swapping words.